It occurs to me God can't perform the impossible, unless we present Him with an "impossible" situation.
He can't be the God of resurrection, unless there is first a "death" (II Corinthians 1:8-10).
He can't SHOW Himself to be God of the impossible unless He undertakes something that, in our eyes, offers absolutely no hope.
He can't really stretch our faith, unless He comes through, literally, in "the 11th hour."
And we can never see Him perform the impossible if we abandon ship and aren't around to witness it when He does.
""For we would not, brethren, have you ignorant of our trouble which came to us in Asia, that we were pressed out of measure, above strength, insomuch that we despaired even of life:
But we had this sentence of death in ourselves, that we should not trust in ourselves, but in God, which raiseth the dead." II Corinthians 1:8-9